Drag-line excavator



A. s. ROBINSON. DRAGLINEA EXCAVATOR. APPLICATION FILED JUNZS, i918. 1,377,278, Patented May 10, 1921,

entre STATE To all 'whom t may concern:

Be it known that I, ARTHUR S. ROBIN- soN, a citizen of the United States, residing at Dayton, in the county of Montgomery and the A frame form of main State of Ohio, have invented a new and use- ARTHUR S. ROBINSON, OF DAYTON, OHIO.

DRAG-LINE EXcAvATon.

Specification of Letters Patent.

Application filed June 29, 1918. Serial No. 242,656.

in the accompanying s PATENT ori-ica Patented May 10, 1921.1

drawings, in which my y or supplemenf the elements of boom as is necessary to provide for the operation of my improvement, the auxiliar tary boom, and as much o ful Improvement in Drag-Line Excavators, auxiliary or supplementary boom, are shown of which the following is a description.

My invention relates to drag-line excavators Vwhich consist essentially of a base supported by wheels or rollers carrying a circular frame containing conical wheels or rollers onwhich revolves a balanced platform supporting a boom and a mechanism including` two drums for operating a hoist or bucket-line and a pulling or dragline respectively; which lines in turn are attached to a bucket or scoop which is filled or loaded by pulling or dragging the bucket toward the machine and backingv away from the excavated area, which, heretofore, has been the only method of operating drag-line machines. And the objects of my invention are:

First, withoutY impairing the usefulness of the machine as heretofore operated, to

change the direction of the operation of the bucket.

Second, to enable the operator to lill wagons, cars, hoppers, scows, etc., standing or situated on either or both sides and close to the machine.

Third, to enable the machine to operate against a bank with an upward and outward movement of the bucket.

Fourth, to make it possible to excavate ahead of the machine and move forward over the excavated area.

Fifth, when operated from the deck'of a scow, to enable the machine to excavate a channel ahead ofthe scow and'move up over the excavated area. p

Sixth, to unload scows and deposit the material on docks or otherV scows, or `on banks alongside of the machine.

Seventh, to excavate material on docks orl other locations and deposit on scows alongside of said docks and otherwise increasing the range of usefulness of dragline excavators.

I attain these objects by constructing the main boom in the form of an A frame, and attaching an auxiliary or supplementary boom to the front ofthe revolving platform of a drag-line excavator between the lower ends or legs ofthe main boom and independent of said main boom, as illustrated in full lines, and the broken lines show the remainder of the main boom and other essential parts of the drag-line excavator.

Similar letters and numerals refer to similar parts throughout the several views. Figure l is a side elevation of a drag-line excavator operating in the usual way and illustrative of the prior art.

Fig. 2 is the side elevation of a drag-line excavator with the addition of my auxiliary or supplementary boom with the lower ends preferably hinged on the front end ofthe revolving platform, and the upper or outer end suspended from the frames of the dragline excavator and elevated at a suitable angle. f

Fig. 3 is a horizontal view or plan of Fig. 2 showing my auxiliary or supplementary boom 'situated between the legs and independent of the main boom and hinged to the front of the revolving platform or frame and its relation to the said main boom.

The position of the bucket at A is the filling position; at B the carrying position and at C the dumping position in all views.

By building. kthe main boom, l, in the form of an A-frame with the lower ends placed at or near the corners, 2, ofthe upper or revolving frame of the drag-line excavator 3, there isv formed an open triangular space betweenl the legs of the main ends preferably hinged to the front of theV revolving frame 3, havingthe upper end supported, preferably bya flexible connection, from the main frame 6, or other suitable point, and having in its upper end 7, two sheaves, one sheave for the bucket-line 8, and one sheave for the drag-line9, and operated by the drums 10 and 11 respectively.

In drag-line machines as heretofore operated, Figl, the bucket-line 8, leads from the drum 10 to the outer end of the main boom l, over a sheave 16, thence and fastened to the bail 13, of the bucket 5, and the dragline 9, leads from the drum. ll: over the guide sheave 15 to, and fastened to the bridle 14.

In my improvement Figs. 2 and 3, I accomplish the reversal of the direction of the bucket by carrying the bucket-line 8, from the drum 10, over one sheave at 7 in the yauxiliary boom 4, and fasten it to the bail consists in changing the bucket-line 8, and

the drag-line 9, from the positions shown in Fig. 1, to the positions shown in Fig. 2, and vice versa.

It is not essential that the bucket always be operated outwardly or away from the main frame as shown in Figs. 2 and 3, but the improved construction herein shown and described also permits the bucket to be operated inwardlv in the usual direction .with increased efficiency. In such construction, the bucket line or control line Swill be carried over the sheavel 16 and thence to the power plant, while the drag line 9 will be carried from the bucket over the sheave in the upper end 7 of the auxiliary boom, and thence to the powerplant. In other words, the bucket would be merely reversed from the position shown in Figs. 2 and 3, and when in reversed position the line 8 would be used as a drag line, and the line 9 as the bucket control line. This would enable the bucket to be dumped in close proximity to the power plant. By adjusting` the auxiliary boom the dumping. point may be varied to and from the main structure, so that the material may be dumped a greater f or less distance away from the base of operation. I am aware that, prior to my invention, drag-line excavators with main booms attached to the front of revolving platforms have been made. I therefore do not claim such a combination broadly; but what I do claim as my invention and desire to secure by Letters Patent is: f

1. In a drag-line excavator the combination of a supporting structure, an auxiliary or supplementary boom, and a main boom,

said auxiliary or supplemental boom being` extended to a point intermediate the terminal planes of the main boom, a scoop bucket and control cables therefor comprising a bucket line and a drag line separately controlled by said booms.

2. In a drag-line excavator, the combination of the A frame type of main boom with an auxiliary boom situated between the legs of the main boom, a scoop bucket and control cables therefor comprising a bucket line Lsupporting structure, a scoop bucket and booms being connected to the supporting structure, a scoop bucket and control cables therefor comprising a bucket line and a drag line separately controlledby said booms.

4e. In a drag-line excavator the combination of a supporting structure, a main boom and an auxiliary or supplementary boom extending in overlapping relation from the control cables therefor comprising a bucket line and a drag line separately controlled by said booms.

5. The combination of an auxiliary or supplementary boom, a main boom the supporting structure of a drag-line excavator, a bucket or scoop and operating cables therefor guided by said booms whereby the bucket or scoop is dropped substantially vertically from the auxiliary boom to a point adjacent to the foot of the main boom and operated thence toward the tip of the main boom, substantially as and for the purposes set forth and described.

6. In a construction of the character described, a boom, a scoop, a drag line and a bucket line controlling the movement of said scoop, means for retrieving said lines, a guide for the drag line, a guide for the bucket line one of said guides being longitudinally adjustable in relation with the boom.

7. In a construction of the character described, a scoop, a drag line anda bucket line controlling the movement of the scoop, a boom, a guide for one of said lines located adjacent to the end of the boom, and an adj ustable guide'for the other line from which the scoop may be droppedsubstantially vertically at'different points intermediate the 110 foot and tip of the boom.

8. In a construction of the character described, a pair ofbooms arranged in overlapping relation and relatively movable in a common plane, a scoop, a drag line therefor carried by one of the booms, and a bucket line therefor carried by the other boom, substantially as specified. f

9. In a construction of the character described, a boom, a scoop, a drag line and a bucket line, controlling the movement of the scoop and relatively adjustable guide elements for the drag line and the bucket line, spaced one from the other, one of said guide elements being adjustable to and from the other element independent of the boom to different intermediate positions.

10. In a drag line excavator, the combination with a supporting structure of a main 1000111 and. 011 auxiliary 1000m 100th mounted 13a for oscillatory movement horizontally in unison, one boom being capable of oscillatory movement vertically independent of the other boom, a scoop, and separate cables con` necting said scoop with each of said booms.

1l. In a drag line excavator, the combination with a supporting structure, of two booms of different lengths extending up wardly and outwardly therefrom in overlapping relation, a scoop bucket, a drag line for the scoop bucket controlled by the longer boom, and a bucket line controlling the movement of the scoop bucket and in turn controlled by the shorter boom.

l2. In a drag line excavator, the combination with a supporting structure of two relatively movable booms extending upwardly' and outwardly therefrom, a scoop bucket, a drag line by which the bucket is actuated,

carried by one of said booms, and a bucket 2Q name to this specication in the presence.

of two subscribing witnesses.

` A. S. ROBINSON.

l/Vitnesses:

C. E. STRIES, A. B. ROBINSON. 

